You can parse the "U+XXXXX" string into a integer of unicode, which in your case should be unicode=0x0002A601. Then you can ensurrogate to have two integers hi and lo.
int unicode, hi, lo;
unicode=0x0002A601;
hi = (unicode - 0x10000) / 0x400 + 0xD800;
lo = (unicode - 0x10000) % 0x400 + 0xDC00;
string s = new String(new char[] { Convert.ToChar(hi), Convert.ToChar(lo) });
The string s is 𪘁. BTW, dealing with unicode, you may want to use System.Globalization.StringInfo.GetTextElementEnumerator to get a TextElement, check MSDN for more details.